gpio: make library immune to error pointers
Most functions that take a GPIO descriptor in need to check the descriptor for IS_ERR(). We do this mostly in the VALIDATE_DESC() macro except for the gpiod_to_irq() function which needs special handling. Cc: stable@vger.kernel.org Reported-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -1373,8 +1373,12 @@ done:
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#define VALIDATE_DESC(desc) do { \
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if (!desc) \
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return 0; \
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if (IS_ERR(desc)) { \
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pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
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return PTR_ERR(desc); \
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} \
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if (!desc->gdev) { \
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pr_warn("%s: invalid GPIO\n", __func__); \
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pr_warn("%s: invalid GPIO (no device)\n", __func__); \
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return -EINVAL; \
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} \
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if ( !desc->gdev->chip ) { \
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@ -1386,8 +1390,12 @@ done:
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#define VALIDATE_DESC_VOID(desc) do { \
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if (!desc) \
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return; \
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if (IS_ERR(desc)) { \
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pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
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return; \
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} \
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if (!desc->gdev) { \
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pr_warn("%s: invalid GPIO\n", __func__); \
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pr_warn("%s: invalid GPIO (no device)\n", __func__); \
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return; \
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} \
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if (!desc->gdev->chip) { \
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@ -2061,7 +2069,7 @@ int gpiod_to_irq(const struct gpio_desc *desc)
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* requires this function to not return zero on an invalid descriptor
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* but rather a negative error number.
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*/
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if (!desc || !desc->gdev || !desc->gdev->chip)
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if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
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return -EINVAL;
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chip = desc->gdev->chip;
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